National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fog/Mist Rain

73°F

23°C

Humidity 94%
Wind Speed S 7 mph
Barometer 29.98 in
Dewpoint 72°F (22°C)
Visibility 5.00 mi
Last update 15 Oct 12:50 pm CDT
Extended Forecast for

Chesterfield IL

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 78. Southwest wind around 10 mph. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Increasing clouds, with a low around 42. Northwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    Low: 42 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers, mainly between 2pm and 5pm. Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 30 mph.

    High: 56 °F

    Breezy.
    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 33. North wind 6 to 16 mph, with gusts as high as 24 mph.

    Low: 33 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 59. Light northeast wind.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 33.

    Low: 33 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 78. Southwest wind around 10 mph. Chance of precipitation is 70%.
Tonight
Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Increasing clouds, with a low around 42. Northwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Friday
A 30 percent chance of showers, mainly between 2pm and 5pm. Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 33. North wind 6 to 16 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 59. Light northeast wind.
Saturday Night
Clear, with a low around 33.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 35.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chesterfield IL
 39.26°N 90.09°W (Elev. 571 ft)
Last Update:
11:21 am CDT Oct 15, 2026
Forecast Valid:
1pm CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation